2022 | Resumo da Aula | 1ª Série | Matemática | Aula 8 - Unidades de Medida Astronômica

Aula Paraná

3 Mar 202204:47

Summary

TLDRIn this educational video, teacher Eliane explains the concept of astronomical units, focusing on how the distance between Earth and the Moon is measured using laser beams and mirrors placed on the Moon during the Apollo missions. The video highlights how light is sent from Earth, reflected off the Moon's mirror, and the time it takes for the light to return, allowing us to calculate the distance (384,405 km). Additionally, the video introduces other astronomical units such as light years, astronomical units (AU), and parsecs, which are used to measure vast distances in space, particularly within our solar system and between stars.

Takeaways

😀 The distance between the Earth and the Moon is measured using a powerful laser beam.
😀 A laser beam is sent from Earth to the Moon, reflecting off a mirror left there during one of the Apollo missions.
😀 The time taken for the laser to travel to the Moon and back helps calculate the distance.
😀 The average distance from Earth to the Moon is approximately 384,405 kilometers.
😀 The speed of light is approximately 1,079,252,184.9 kilometers per hour.
😀 Using the known speed of light and distance, the time taken for the laser beam to travel to the Moon and back is calculated to be 1.28 seconds.
😀 Astronomical units of measurement are used to measure vast distances in space.
😀 An astronomical unit (AU) is the average distance between Earth and the Sun, approximately 149,509,035.7 kilometers.
😀 A light-year is the distance that light travels in one year, which is around 9 trillion 460 billion kilometers.
😀 A parsec is another large unit of measurement used to measure distances between stars, equivalent to about 3.26 light-years.

Q & A

What is the method used to measure the distance between the Earth and the Moon?
-The distance between the Earth and the Moon is measured using a laser beam. A powerful light beam is sent from Earth to the Moon, reflecting off a mirror placed on the Moon during the Apollo missions. The time it takes for the light to travel to the Moon and back is measured to calculate the distance.
What role did the Apollo missions play in measuring the distance between the Earth and the Moon?
-The Apollo missions left mirrors on the Moon's surface. These mirrors reflect light beams sent from Earth, helping to accurately measure the time it takes for the light to travel to the Moon and back, allowing scientists to calculate the distance.
What is the average distance between the Earth and the Moon?
-The average distance between the Earth and the Moon is approximately 384,405 kilometers.
How is the distance between the Earth and the Moon calculated?
-The distance is calculated by sending a light beam to the Moon, measuring the time it takes for the beam to travel to the Moon and back, and then using the speed of light to determine the distance.
What is the speed of light used in the calculation of the Earth's distance to the Moon?
-The speed of light used in the calculation is approximately 1,079,252,184.9 kilometers per hour.
How do you convert the time taken by the light to return from hours to seconds?
-To convert the time from hours to seconds, you multiply the time in hours by 3600 (the number of seconds in an hour).
What is the time it takes for a light beam to travel to the Moon and back?
-The time it takes for the light beam to travel to the Moon and back is approximately 1.28 seconds.
What is a light-year, and how is it defined?
-A light-year is the distance that light travels in one year. It is approximately 9 trillion 460 billion kilometers.
What is an astronomical unit (AU), and what distance does it represent?
-An astronomical unit (AU) is a standard unit of distance used in astronomy. It represents the average distance between the Earth and the Sun, which is approximately 149.6 million kilometers.
What is a parsec, and what does it measure?
-A parsec is a large unit of distance used in astronomy to measure distances between stars. One parsec is approximately 3.26 light-years.